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| Mirrors > Home > MPE Home > Th. List > Mathboxes > recbothd | Structured version Visualization version GIF version | ||
| Description: Take reciprocal on both sides. (Contributed by metakunt, 12-May-2024.) |
| Ref | Expression |
|---|---|
| recbothd.1 | ⊢ (𝜑 → 𝐴 ∈ ℂ) |
| recbothd.2 | ⊢ (𝜑 → 𝐴 ≠ 0) |
| recbothd.3 | ⊢ (𝜑 → 𝐵 ∈ ℂ) |
| recbothd.4 | ⊢ (𝜑 → 𝐵 ≠ 0) |
| recbothd.5 | ⊢ (𝜑 → 𝐶 ∈ ℂ) |
| recbothd.6 | ⊢ (𝜑 → 𝐶 ≠ 0) |
| recbothd.7 | ⊢ (𝜑 → 𝐷 ∈ ℂ) |
| recbothd.8 | ⊢ (𝜑 → 𝐷 ≠ 0) |
| Ref | Expression |
|---|---|
| recbothd | ⊢ (𝜑 → ((𝐴 / 𝐵) = (𝐶 / 𝐷) ↔ (𝐵 / 𝐴) = (𝐷 / 𝐶))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | recbothd.1 | . . . . . . 7 ⊢ (𝜑 → 𝐴 ∈ ℂ) | |
| 2 | recbothd.3 | . . . . . . 7 ⊢ (𝜑 → 𝐵 ∈ ℂ) | |
| 3 | recbothd.4 | . . . . . . 7 ⊢ (𝜑 → 𝐵 ≠ 0) | |
| 4 | 1, 2, 3 | divcld 11922 | . . . . . 6 ⊢ (𝜑 → (𝐴 / 𝐵) ∈ ℂ) |
| 5 | recbothd.2 | . . . . . . 7 ⊢ (𝜑 → 𝐴 ≠ 0) | |
| 6 | 1, 2, 5, 3 | divne0d 11938 | . . . . . 6 ⊢ (𝜑 → (𝐴 / 𝐵) ≠ 0) |
| 7 | 4, 6 | jca 511 | . . . . 5 ⊢ (𝜑 → ((𝐴 / 𝐵) ∈ ℂ ∧ (𝐴 / 𝐵) ≠ 0)) |
| 8 | recbothd.5 | . . . . . . 7 ⊢ (𝜑 → 𝐶 ∈ ℂ) | |
| 9 | recbothd.7 | . . . . . . 7 ⊢ (𝜑 → 𝐷 ∈ ℂ) | |
| 10 | recbothd.8 | . . . . . . 7 ⊢ (𝜑 → 𝐷 ≠ 0) | |
| 11 | 8, 9, 10 | divcld 11922 | . . . . . 6 ⊢ (𝜑 → (𝐶 / 𝐷) ∈ ℂ) |
| 12 | recbothd.6 | . . . . . . 7 ⊢ (𝜑 → 𝐶 ≠ 0) | |
| 13 | 8, 9, 12, 10 | divne0d 11938 | . . . . . 6 ⊢ (𝜑 → (𝐶 / 𝐷) ≠ 0) |
| 14 | 11, 13 | jca 511 | . . . . 5 ⊢ (𝜑 → ((𝐶 / 𝐷) ∈ ℂ ∧ (𝐶 / 𝐷) ≠ 0)) |
| 15 | 7, 14 | jca 511 | . . . 4 ⊢ (𝜑 → (((𝐴 / 𝐵) ∈ ℂ ∧ (𝐴 / 𝐵) ≠ 0) ∧ ((𝐶 / 𝐷) ∈ ℂ ∧ (𝐶 / 𝐷) ≠ 0))) |
| 16 | rec11 11844 | . . . 4 ⊢ ((((𝐴 / 𝐵) ∈ ℂ ∧ (𝐴 / 𝐵) ≠ 0) ∧ ((𝐶 / 𝐷) ∈ ℂ ∧ (𝐶 / 𝐷) ≠ 0)) → ((1 / (𝐴 / 𝐵)) = (1 / (𝐶 / 𝐷)) ↔ (𝐴 / 𝐵) = (𝐶 / 𝐷))) | |
| 17 | 15, 16 | syl 17 | . . 3 ⊢ (𝜑 → ((1 / (𝐴 / 𝐵)) = (1 / (𝐶 / 𝐷)) ↔ (𝐴 / 𝐵) = (𝐶 / 𝐷))) |
| 18 | 17 | bicomd 223 | . 2 ⊢ (𝜑 → ((𝐴 / 𝐵) = (𝐶 / 𝐷) ↔ (1 / (𝐴 / 𝐵)) = (1 / (𝐶 / 𝐷)))) |
| 19 | 1, 2, 5, 3 | recdivd 11939 | . . 3 ⊢ (𝜑 → (1 / (𝐴 / 𝐵)) = (𝐵 / 𝐴)) |
| 20 | 8, 9, 12, 10 | recdivd 11939 | . . 3 ⊢ (𝜑 → (1 / (𝐶 / 𝐷)) = (𝐷 / 𝐶)) |
| 21 | 19, 20 | eqeq12d 2753 | . 2 ⊢ (𝜑 → ((1 / (𝐴 / 𝐵)) = (1 / (𝐶 / 𝐷)) ↔ (𝐵 / 𝐴) = (𝐷 / 𝐶))) |
| 22 | 18, 21 | bitrd 279 | 1 ⊢ (𝜑 → ((𝐴 / 𝐵) = (𝐶 / 𝐷) ↔ (𝐵 / 𝐴) = (𝐷 / 𝐶))) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 = wceq 1542 ∈ wcel 2114 ≠ wne 2933 (class class class)co 7360 ℂcc 11027 0cc0 11029 1c1 11030 / cdiv 11798 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-sep 5231 ax-nul 5241 ax-pow 5302 ax-pr 5370 ax-un 7682 ax-resscn 11086 ax-1cn 11087 ax-icn 11088 ax-addcl 11089 ax-addrcl 11090 ax-mulcl 11091 ax-mulrcl 11092 ax-mulcom 11093 ax-addass 11094 ax-mulass 11095 ax-distr 11096 ax-i2m1 11097 ax-1ne0 11098 ax-1rid 11099 ax-rnegex 11100 ax-rrecex 11101 ax-cnre 11102 ax-pre-lttri 11103 ax-pre-lttrn 11104 ax-pre-ltadd 11105 ax-pre-mulgt0 11106 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-nel 3038 df-ral 3053 df-rex 3063 df-rmo 3343 df-reu 3344 df-rab 3391 df-v 3432 df-sbc 3730 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-nul 4275 df-if 4468 df-pw 4544 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-br 5087 df-opab 5149 df-mpt 5168 df-id 5519 df-po 5532 df-so 5533 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 df-res 5636 df-ima 5637 df-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-riota 7317 df-ov 7363 df-oprab 7364 df-mpo 7365 df-er 8636 df-en 8887 df-dom 8888 df-sdom 8889 df-pnf 11172 df-mnf 11173 df-xr 11174 df-ltxr 11175 df-le 11176 df-sub 11370 df-neg 11371 df-div 11799 |
| This theorem is referenced by: lcmineqlem11 42492 |
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